<template>
  <div class='sub-category'>
    <div class="container">
      <!-- 面包屑 -->
      <SubBread />
      <SubFilter @sort-change="changeFilter" />
      <div class="goods-list">
        <!-- 排序 -->
        <SubSort @filter-change="changeSort" />
        <!-- 列表 -->
        <ul>
          <li v-for="item in goodsList" :key="item.id" >
            <GoodsItem :goods="item" />
          </li>
        </ul>
        <!-- 加载 -->
        <InfiniteLoading :loading="loading" :finished="finished" @infinite="getData" />
      </div>
    </div>
  </div>
</template>

<script setup>
import SubBread from './sub-bread'
import SubFilter from './sub-filter'
import SubSort from './sub-sort'
import GoodsItem from './goods-item'
import InfiniteLoading from '@/components/infinite-loading'
import { findSubCategoryGoods } from '@/api/category'
import { useRoute } from 'vue-router'
import { onMounted, ref, watch } from 'vue'
  const route = useRoute()

  const loading = ref(false)
  const finished = ref(false)
  const goodsList = ref([])
  // 查询参数
  let reqParams = {
    page: 1,
    pageSize: 20
  }
  onMounted(() => {
    getData()
  })
  // 获取数据函数
  const getData = () => {
    loading.value = true
    reqParams.categoryId = route.params.id
    findSubCategoryGoods(reqParams).then(({ result }) => {
      if (result.items.length) {
        goodsList.value.push(...result.items)
        reqParams.page++
      } else {
        // 加载完毕
        finished.value = true
      }
      // 请求结束
      loading.value = false
    })
  }

  // 切换二级分类重新加载
  watch(() => route.params.id, (newVal) => {
    if (newVal && route.path === ('/category/sub/' + newVal)) {
      goodsList.value = []
      reqParams = {
        page: 1,
        pageSize: 20
      }
      finished.value = false
    }
  })
  // 监听筛选区改变
  const changeFilter = (filterParams) => {
    reqParams = { ...reqParams, ...filterParams }
    reqParams.page = 1
    goodsList.value = []
    finished.value = false
  }
  // 监听排序改变
  const changeSort = (sortParams) => {
    reqParams = { ...reqParams, ...sortParams }
    reqParams.page = 1
    goodsList.value = []
    finished.value = false
  }
</script>

<style scoped lang="less">
.goods-list {
  background: #fff;
  padding: 0 25px;
  margin-top: 25px;
  ul {
    display: flex;
    flex-wrap: wrap;
    padding: 0 5px;
    li {
      margin-right: 20px;
      margin-bottom: 20px;
      &:nth-child(5n) {
        margin-right: 0;
      }
    }
  }
}
</style>